Re: Need to import the XML schema namespace
On Wed, 2010-05-05 at 20:47 -0700, Jeff Greif wrote: > Most XML Schemas in the wild reference some of the types in the > http://www.w3.org/2001/XMLSchema namespace, but they usually do so > without explicitly importing it, so it apparently unnecessary in > practice, if not normatively. > I can't find any reference in the XML Schema 1.0 spec that says it is > either illegal or unnecessary to import this namespace, for example, > using xs:import. Similarly, I can't find any further interoperability > guidelines on this subject in the WSI-Basic Profile 1.0. xs:import does not "import a namespace" - it imports a schema that defines a vocabulary of elements and/or attributes associated with that namespace URI. This distinction is very important. You could not write a schema to define xs:integer or xs:string - they are fundamental building blocks. So, the Schema language has them as built-ins (in part 2 datatypes), and its neither necessary nor actually possible to "import" them. > Does anyone have a reference to a definitive statement of whether this > import is required, optional or forbidden in XML Schemas that reference > the data types of this namespace? It's a meaningless question, you'll be glad to know :-) Or, it would be like asking which header file you #include in C or C++ to get the keywords like "int" and "switch" and return"... Hope this helps. Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://fromoldbooks.org/ Ankh: irc.sorcery.net irc.gnome.org www.advogato.org
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